Search found 5033 matches

by Jirka
Wed Sep 30, 2020 3:39 pm
Forum: Hydrus 1D
Topic: I cant save after editing profile information
Replies: 1
Views: 24

Re: I cant save after editing profile information

That’s a correct behavior of the software. From your posts, it is clear to me that you are completely new to HYDRUS-1D. You should do some of the tutorials posted on the HYDRUS-1D website (http://www.pc-progress.com/en/Default.aspx?h1d-tutorials) or from the CSIRO Tutorial eBook: https://www.pc-prog...
by Jirka
Wed Sep 30, 2020 3:36 pm
Forum: Hydrus 1D
Topic: exporting data and fitting breakthrough curve
Replies: 1
Views: 11

Re: exporting data and fitting breakthrough curve

I do not understand what exactly you want to do. However, all input and output files in HYDRUS-1D as text files and it should be easy to open them with any text editor or Excel. Their detailed description can be found in the Technical manual, which you can from the Help menu. J.
by Jirka
Tue Sep 29, 2020 11:12 pm
Forum: HYDRUS (2D/3D)
Topic: mesh line length
Replies: 4
Views: 41

Re: mesh line length

Indeed, that’s how one can get the length of a meshline, i.e., displaying some property along a cross-section (i.e., meshline), and displaying “displayed” chart data. The meshline is defined strictly along element sides from point to point. The “boundary length” may be slightly different since the e...
by Jirka
Tue Sep 29, 2020 9:38 pm
Forum: HYDRUS (2D/3D)
Topic: Unit of Retardation factor in case of nonlinear adsorption
Replies: 3
Views: 25

Re: Unit of Retardation factor in case of nonlinear adsorption

I think you need to use the same units as the units in the Freundlich isotherm are as follows:
Freundlich.png
Freundlich.png (6.74 KiB) Viewed 10 times
where subscripts c, s, and w stand for contaminant, soil, and water, respectively.

J.
by Jirka
Tue Sep 29, 2020 9:24 pm
Forum: HYDRUS (2D/3D)
Topic: Can solute concentrations exceed the input value
Replies: 2
Views: 15

Re: Can solute concentrations exceed the input value

I think that concentrations can go up only due to the following processes that can be considered in HYDRUS: evaporation, root water uptake, production, or desorption from the nonequilibrium phase (immobile water of kinetic sorption sites). J.
by Jirka
Tue Sep 29, 2020 9:16 pm
Forum: Hydrus 1D
Topic: Evaporation Simulation
Replies: 12
Views: 371

Re: Evaporation Simulation

I do not have any. I never use any other SH functions than from my dear mentor (VG) :) . J.
by Jirka
Tue Sep 29, 2020 3:30 am
Forum: HYDRUS (2D/3D)
Topic: Unit of Retardation factor in case of nonlinear adsorption
Replies: 3
Views: 25

Re: Unit of Retardation factor in case of nonlinear adsorption

When calculating the units of the retardation factor for nonlinear sorption, you need to take into account the fact that the distribution coefficient ks relating the solution and adsorbed concentrations has units for linear sorption of [L^3/M] and for nonlinear Freundlich sorption, they are [L^(3β) ...
by Jirka
Mon Sep 28, 2020 5:49 pm
Forum: Hydrus 1D
Topic: Evaporation Simulation
Replies: 12
Views: 371

Re: Evaporation Simulation

If you get different profiles for the VG and BC models, it is likely related with how these two models describe soil hydraulic properties at the dry end, when the vapor flow becomes important. You should look into that. I do not have time to look at your projects (I’m too busy with teaching now when...
by Jirka
Mon Sep 28, 2020 2:43 pm
Forum: HYDRUS (2D/3D)
Topic: mesh line length
Replies: 4
Views: 41

Re: mesh line length

We do not print to the output, or even calculate internally, the length of the meshline. We do no need it for the calculations. If you want to calculate it, you would need to do it from the coordinates of the nodes that define the meshline. J.
by Jirka
Mon Sep 28, 2020 12:18 am
Forum: HYDRUS (2D/3D)
Topic: axially symmetric domain
Replies: 4
Views: 33

Re: axially symmetric domain

Unless the emitter is circular around the tree, you cannot simulate this system as an axisymetrical system. You need to either assume a 2D domain with symmetry around the vertical axis, or you need to simulate this as a fully 3D domain. J.
by Jirka
Sat Sep 26, 2020 7:58 pm
Forum: HYDRUS (2D/3D)
Topic: modeling solute transport
Replies: 3
Views: 46

Re: modeling solute transport

It is not. If you have a plume, it likely spreads more in the longitudinal direction than in the perpendicular direction. You need to constrain the optimized parameters. J.
by Jirka
Sat Sep 26, 2020 7:46 pm
Forum: HYDRUS (2D/3D)
Topic: axially symmetric domain
Replies: 4
Views: 33

Re: axially symmetric domain

You post is not completely clear to me. On the one hand, you write that you are using an axially symmetric domain, but also that the dripper is 1.5 m from the trunk. That would imply that the emitter is a circular drip line with a radius of 1.5 m. Is that so? When you use radially symmetric domain, ...
by Jirka
Thu Sep 24, 2020 5:26 pm
Forum: HYDRUS (2D/3D)
Topic: modeling solute transport
Replies: 3
Views: 46

Re: modeling solute transport

You need to specify cValue1, 2, or 3 in “Time-Variable Boundary Conditions” and then select the “Pointer to the vector of boundary conditions” (selecting cValue1, 2, or 3) when assigning Solute Transport BC on the boundary. J.
SoluteBC.png
SoluteBC.png (4.02 KiB) Viewed 41 times
by Jirka
Tue Sep 22, 2020 4:28 pm
Forum: Hydrus 1D
Topic: Comparison of simulated water tables with measured
Replies: 1
Views: 54

Re: Comparison of simulated water tables with measured

If the groundwater table is within the simulated soil profile, then the bottom pressure head (positive) gives you the information about its position. J.
by Jirka
Tue Sep 22, 2020 3:39 pm
Forum: HYDRUS (2D/3D)
Topic: no hysteretic loop
Replies: 5
Views: 206

Re: no hysteretic loop

Great to hear that. Good luck. Jirka